When throwing a ball, why does the triceps muscle contract? •The contraction of the triceps muscle causes the arm to flex

•The contraction of the triceps muscle causes the arm to extend

•When added to the force of the biceps contracting it provides extra force to the ball.

•The triceps muscle needs to contract in order to keep the biceps muscle from relaxing ,

I think it might be A, it seems the most reasonable.

Explanation:

the reason why I say that is because

B, contraction is more tense and it is shortened meaning it wouldn't be able to relax so it wouldn't extend.

C, it doesn't really give you a explanation of why the tricep muscle contracts.

D, triceps are made to relax, which means it is the opposite of contraction because the tricep needs to relax in order for the bicep to contract.

Sorry if I'm wrong :/

the dark variety, as they are not visible on the dark tree barks

explanation:

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high